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Maybe you can unlock your phone using blackberry 7290 unlock code, that code can be obtained from network provider or buy from blackberry unlock code seller on internet. Other way, you can bring your cellphone to mobile repair shop to get hard unlocked using cable unlock.

you can get this Blackberry imei unlock code from your network provider or get from third party,both are safe way to Unlock your Blackberry 7290.when you go to online you can find so many sites of Blackberry imei Unlock Code. they will charge little amount for your Blackberry Unlocking Codes. i hope this will help you:) Best of Luck.

You have to unlock that BB first
This unlock code provider generate full LEGAL unlock code direct from
Blackberry server which wont void your warranty, & generate code
based on your IMEI, means individual code for every blackberry set.
After unlocking from this provider's code your blackberry not only work
with single network, you can use your Blackberry in any part of world
with any
network
including your browser & MMS picture messaging to work, yes with
just one time entering code from your keypad.
They unlock from network who locked your blackberry
This site will help you a lot & good email & 24/7 phone support

This unlock code provider generate full LEGAL unlock code direct from
Blackberry server which wont void your warranty, & generate code
based on your IMEI, means individual code for every blackberry set.
After unlocking from this provider's code your blackberry not only work
with single network, you can use your Blackberry in any part of world
with any
network
including your browser & MMS picture messaging to work, yes with
just one time entering code from your keypad.
They unlock from network who locked your blackberry
This site will help you a lot & good email & 24/7 phone support

I am actually unsure what could have caused this. It might not be unlocked correctly or could have been damaged when the software was modified. But T-Mobile carried the BB7290 so if you can get ahold of the person who unlocked it for you I would ask for a branded T-Mobile phone.